crossover duct

[Joe]

Hello, I have a quick question. I have a 2002 Wick Artcraft on a concrete slab. I was under it about a year ago and noticed the crossover laying on the slab. Its about 8 inches in diameter and probably would'nt fit inside the floor. My question is, is this the normal way things should be or not and is this something to worry about. Would critters eat thru this? I have concrete blocks for skirting .

Joe

[Mac]

Yes, it can rest on the slab, that is fine. Critters would have a tough time getting in if your skirting fits closely. I have the same setup. Very rarely we would encounter mice - turned out they were coming in through holes in the subfloor for plumbing. Spray foam cured that - and I then took the foam to the house/skirting gap. Mice don't seem to chew through it.

[joe]

Thanks Mac, Yes I have also taken the foam to the skirting/house gap. Got a little more to go.

Joe

[rmurray]

The local code and the owners manual probably requires the crossover to be strapped up off the ground....8 inch seems a littler small for a crossover pipe....

[Eugene]

The HUD code prohibits the cross over duct from laying on the ground.
You are loosing a ton of heat!

[joe]

Its laying on the slab, how do you strap this up?

Joe

[rmurray]

Maybe Eugene will answer....But I would have thought anchor bolts should have been put in the concrete slab......

[Mitch Vierra]

If it is a flex tubing crossover and there is room between it and the frame I always strapped it with plumbers tape to the marriage line.

[Eugene]

Mitch is right, use straps, spaced 4' oc. sometimes you might need to support the flex duct with a firring strip.
The installation instructions from the home will show you how to do this!

[Mac]

Well, my duct is insulated (granted, R-8 I believe is stock) - I can't imagine how it is going to lose more than .5% of the heat - since there's only a small bit of plastic on the outside of the duct touching the plastic on the slab. That can't conduct much heat away. But it would be easy to strap up with plastic plumber's tape.